CN113631322A - Flux-cored wire, welding method, and weld metal - Google Patents
Flux-cored wire, welding method, and weld metal Download PDFInfo
- Publication number
- CN113631322A CN113631322A CN202080025154.XA CN202080025154A CN113631322A CN 113631322 A CN113631322 A CN 113631322A CN 202080025154 A CN202080025154 A CN 202080025154A CN 113631322 A CN113631322 A CN 113631322A
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- 238000003466 welding Methods 0.000 title claims abstract description 159
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 133
- 239000002184 metal Substances 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims description 15
- 239000000843 powder Substances 0.000 claims abstract description 98
- 230000004907 flux Effects 0.000 claims abstract description 62
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 claims abstract description 52
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 35
- 229910001637 strontium fluoride Inorganic materials 0.000 claims abstract description 30
- FVRNDBHWWSPNOM-UHFFFAOYSA-L strontium fluoride Chemical compound [F-].[F-].[Sr+2] FVRNDBHWWSPNOM-UHFFFAOYSA-L 0.000 claims abstract description 29
- 229910001632 barium fluoride Inorganic materials 0.000 claims abstract description 23
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 15
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims abstract description 10
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 51
- 239000000203 mixture Substances 0.000 claims description 27
- 150000002736 metal compounds Chemical class 0.000 claims description 24
- 229910052749 magnesium Inorganic materials 0.000 claims description 15
- 229910052782 aluminium Inorganic materials 0.000 claims description 14
- 229910052783 alkali metal Inorganic materials 0.000 claims description 13
- 229910052726 zirconium Inorganic materials 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 9
- 238000010586 diagram Methods 0.000 claims description 8
- 150000005323 carbonate salts Chemical class 0.000 claims description 4
- 239000004480 active ingredient Substances 0.000 claims description 3
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- 229910001209 Low-carbon steel Inorganic materials 0.000 description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 13
- 229910052760 oxygen Inorganic materials 0.000 description 13
- 239000001301 oxygen Substances 0.000 description 13
- 239000000126 substance Substances 0.000 description 13
- 229910045601 alloy Inorganic materials 0.000 description 12
- 239000000956 alloy Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 229910052721 tungsten Inorganic materials 0.000 description 11
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 10
- 229910052761 rare earth metal Inorganic materials 0.000 description 10
- 239000010936 titanium Substances 0.000 description 10
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- 230000008021 deposition Effects 0.000 description 9
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 238000009835 boiling Methods 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 8
- 230000006872 improvement Effects 0.000 description 8
- 239000010935 stainless steel Substances 0.000 description 8
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 8
- 239000010937 tungsten Substances 0.000 description 8
- 229910052748 manganese Inorganic materials 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 229910052719 titanium Inorganic materials 0.000 description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 5
- 150000001340 alkali metals Chemical class 0.000 description 5
- 239000002585 base Substances 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
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- 229910052759 nickel Inorganic materials 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 5
- 230000002411 adverse Effects 0.000 description 4
- OYLGJCQECKOTOL-UHFFFAOYSA-L barium fluoride Chemical compound [F-].[F-].[Ba+2] OYLGJCQECKOTOL-UHFFFAOYSA-L 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 229910052758 niobium Inorganic materials 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 4
- 238000011105 stabilization Methods 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 229910052788 barium Inorganic materials 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000002360 explosive Substances 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 229910052715 tantalum Inorganic materials 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- 239000011800 void material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 206010070834 Sensitisation Diseases 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910000870 Weathering steel Inorganic materials 0.000 description 2
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- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
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- 229910000859 α-Fe Inorganic materials 0.000 description 2
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- 229910052684 Cerium Inorganic materials 0.000 description 1
- 241001456553 Chanodichthys dabryi Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910002551 Fe-Mn Inorganic materials 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910020440 K2SiF6 Inorganic materials 0.000 description 1
- 229910000733 Li alloy Inorganic materials 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910006639 Si—Mn Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
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- 108010063123 alfare Proteins 0.000 description 1
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- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- -1 barium oxide Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
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- WLTSUBTXQJEURO-UHFFFAOYSA-N thorium tungsten Chemical compound [W].[Th] WLTSUBTXQJEURO-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3602—Carbonates, basic oxides or hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3603—Halide salts
- B23K35/3605—Fluorides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/362—Selection of compositions of fluxes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The present invention relates to a flux-cored wire for gas-shielded arc welding of positive polarity, wherein the flux contains a metal powder and BaF as a fluoride2And SrF2、AlF3And/or CaF2In the range of BaF2：1.0～4.5％、SrF2: 2.0% or less of CaF2: AlF less than 0.45%3: 0.70% or less, at least 1 of the metal elements constituting them is a strongly deoxidizing metal element having a specific standard of Gibbs energy generation, and the contents of both oxides and carbonates in the flux are 0.5% or less.
Description
Technical Field
The present invention relates to a flux-cored wire, and more particularly, to a flux-cored wire suitable for all-position welding and having excellent welding operability and welding efficiency. In addition, the invention also relates to a welding method and a welding metal using the flux-cored wire.
Background
Flux-cored wires have been used in general, and are applicable to all postures including horizontal welding, vertical welding, horizontal welding, overhead welding, and the like. However, in horizontal welding, vertical welding, and overhead welding, welding is more difficult to perform, and it is difficult to obtain good welding workability in all postures, as compared with horizontal welding.
In contrast, patent document 1 discloses a flux-cored wire for gas-shielded arc welding, which is made of Al, Mg and BaF2The flux components necessary are contained in specific amounts, and the flux filling ratio and the contents of Mn and Si with respect to the total mass of the wire are optimized. When the flux-cored wire is used, gas-shielded arc welding is performed with a direct current positive polarity in a welding current range from a low current to a medium current, the amount of spatter generated in all-position welding is small, and in addition, the weldability is good and a weld metal having good toughness can be obtained. In patent document 1, the welding current range from the low current to the medium current is about 50 to 300A.
Further, patent document 2 discloses a carbon dioxide gas shielded arc welding flux-cored wire including Al, Mg and BaF2The flux component is contained in a specific amount as a necessary flux component, and the content of Zr with respect to the total mass of the wire is optimized. When the flux-cored wire is used, in the welding of galvanized steel sheets, arc welding is performed with a direct-current positive polarity in a welding current range from a low current to a medium current, the weldability is good in all postures, the amount of spatter generation is small, and a weld metal having good toughness can be obtained. In patent document 2, the welding current range from low current to medium current is about 70 to 300A.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 11-058069
Patent document 2: japanese laid-open patent publication No. 11-207491
However, the flux-cored wire of patent documents 1 and 2 is applied with a welding current of about 300A at the upper limit, but actually, in vertical welding where welding is difficult, welding is performed at a welding current of 200A and a welding speed of 15 cm/min.
In such a posture where the molten pool is affected by gravity, such as a vertical welding posture, if the welding current is increased or the welding speed is increased, bead shape defects such as burnout, beading, and undercut are likely to occur. Therefore, in the welding in this posture, it is necessary to perform welding in a low current region at a low welding speed, and there is room for improvement from the viewpoint of efficiency of the welding operation. In particular, in overhead welding, since the molten pool is most significantly affected by gravity in the welding posture, it is most necessary to reduce the welding current and the welding speed, and it is difficult to improve the capability.
Disclosure of Invention
Accordingly, an object of the present invention is to provide a flux-cored wire which can prevent burnthrough in all-position welding, particularly in overhead welding, and has a good bead shape and high deposition performance.
As a result of intensive studies, the present inventors have found that the flux in the flux-cored wire can contain a specific fluoride powder and a strongly deoxidizing metallic element, and the composition thereof can be controlled within a specific range, and have completed the present invention.
That is, the present invention relates to the following [1] to [14 ].
[1] A flux-cored wire for gas-shielded arc welding of positive polarity,
the flux of the flux-cored wire contains fluoride powder and metal powder,
the fluoride powder comprises BaF2And from SrF2、AlF3And CaF2At least one selected from the group consisting of, in mass% relative to the total mass of the welding wire,
BaF2：1.0～4.5％、
SrF2: less than 2.0 percent,
CaF2: 0.45% or less, and
AlF3: less than 0.70%，
At least 1 metal element among the metal elements constituting the fluoride powder and the metal powder is at least one point of-200 to-150 kcal/mol O in Gibbs energy at 1500 to 1600 ℃ in an Ehrunham diagram when used as an oxide2The strong deoxidizing metal element of (a) is,
further, the contents of the oxides and carbonates in the flux are, in mass% with respect to the total mass of the wire,
oxide: 0.5% or less, and
carbonate salt: less than 0.5 percent.
[2]According to [1] above]The flux-cored wire is characterized in that SrF in the fluoride powder2、AlF3And CaF2The content of (B) satisfies 0.5 & lt & gtSrF in mass% relative to the total mass of the welding wire2(％)+10.1×CaF2(％)+2.3×AlF3(%) relationship.
[3] The flux-cored wire according to [1], wherein the strongly deoxidizing metallic element is at least 1 element selected from the group consisting of Al, Mg, and Zr, and the content thereof is in terms of a mass relative to the total mass of the wire,
Al：12×10－4less than mol/g,
Mg：5×10－4Less than mol/g,
Zr：5×10－4mol/g or less, and
(Al+Mg+Zr)：8×10－4～15×10－4mol/g。
[4] the flux-cored wire according to the item [1], wherein a flux rate is 10 to 20% by mass with respect to the total mass of the wire.
[5] The flux-cored wire according to [1], wherein a total content of the fluoride powders is higher than 2% and 6% or less in mass% with respect to a total mass of the wire,
the BaF2、SrF2、AlF3And CaF2Is higher than 2% and not more than 5% in mass% relative to the total mass of the welding wire, and
the BaF is contained in an amount corresponding to the total amount of the fluoride powder2、SrF2、AlF3And CaF2The ratio of the total content of (B)/(BaF)2+SrF2+AlF3+CaF2) Total amount of fluoride powder } is 0.5 or more.
[6] The flux-cored wire according to the item [1], wherein a composition of the flux-cored wire in% by mass with respect to a total mass of the wire is further satisfied
C: less than 0.5 percent,
Si: less than 2.0 percent,
Mn: less than 3.0 percent,
Ni: less than 5 percent of,
Mo: less than 3.0 percent,
W: less than 3.0 percent,
Nb: less than 3.0 percent,
V: less than 3.0 percent,
Cr: less than 5 percent of,
Ti: less than 3.0 percent,
N: less than 0.05 percent of,
S: less than 0.05 percent of,
P: less than 0.05 percent of,
B: less than 0.05 percent of,
Cu: less than 2.0 percent,
Ta: 3.0% or less, and
REM: less than 0.1%.
[7] The flux-cored wire according to the item [1], wherein a composition of the flux-cored wire in% by mass with respect to a total mass of the wire is further satisfied
C: less than 0.5 percent,
Si: less than 2.0 percent,
Mn: less than 3.0 percent,
Ni：5～20％、
Mo: less than 5.0 percent,
W: less than 3.0 percent,
Nb: less than 3.0 percent,
V: less than 3.0 percent,
Cr：15～30％、
Ti: less than 3.0 percent,
N: less than 0.50 percent of,
S: less than 0.05 percent of,
P: less than 0.05 percent of,
B: less than 0.05 percent of,
Cu: less than 2.0 percent,
Ta: 3.0% or less, and
REM: less than 0.1%.
[8] The flux-cored wire according to [6], wherein a total content of the metal powder composed of one or more alkali metal elements and the metal compound in the flux-cored wire is 3% or less in mass% with respect to a total mass of the wire, and the balance is Fe and impurities.
[9] The flux-cored wire according to [7], wherein a total content of the metal powder composed of one or more alkali metal elements and the metal compound in the flux-cored wire is 3% or less in mass% with respect to a total mass of the wire, and the balance is Fe and impurities.
[10]According to [1] above]The flux-cored wire described above, wherein the strongly deoxidizing metallic element contains Mg as a Mg-containing metallic powder, and the Mg content as the Mg-containing metallic powder and the AlF are3In terms of the amount of substance relative to the total mass of the welding wire, satisfies
1.0×10－4≤Mg(mol/g)+AlF3(mol/g)≤5.0×10－4The relationship (2) of (c).
[11] A welding method using a flux-cored wire for positive polarity and a shield gas,
the flux-cored wire comprises fluoride powder and metal powder in a flux,
the fluoride powder contains BaF2And from SrF2、AlF3And CaF2At least one selected from the group consisting of, in mass% relative to the total mass of the welding wire,
BaF2：1.0～4.5％、
SrF2: less than 2.0 percent,
CaF2: 0.45% or less, and
AlF3: the content of the active ingredients is less than 0.70%,
at least 1 metal element among the metal elements constituting the fluoride powder and the metal powder is an Ehringham diagram when it is an oxide, and at least one point of Gibbs energy generated in a standard range of 1500 to 1600 ℃ is-200 to-150 kcal/mol O2The strong deoxidizing metal element of (a) is,
further, the contents of the oxides and carbonates in the flux are, in mass% with respect to the total mass of the wire,
oxide: 0.5% or less, and
carbonate salt: less than 0.5 percent.
[12]According to [11]]The welding method described above, wherein the shielding gas contains 60 vol% or more of CO2A gas.
[13] The welding method according to [11], wherein the shielding gas contains 60 vol% or more of Ar gas.
[14] A weld metal formed by welding using the flux-cored wire according to any one of [1] to [10 ].
According to the flux-cored wire and the welding method using the same of the present invention, the heat energy acting on the flux-cored wire is controlled by the additive element, and the deposition amount of the flux-cored wire can be increased. Therefore, the efficiency of the welding operation can be improved. Further, an appropriate oxide film can be formed on the surface of the molten pool, and burning-through can be prevented in all-position welding, particularly in overhead welding, to obtain a good bead shape.
Drawings
FIG. 1 is a graph showing the temperature transition of a thoriated tungsten electrode (thoriated tungsten electrode).
FIG. 2 is a graph showing the relationship between the current generated by hot electrons at 2300K and the work function for each filament diameter.
Fig. 3 is a graph showing the relationship between the wire diameter and the work function that can obtain a stable thermoanion.
Detailed Description
Hereinafter, a flux-cored wire used for carrying out the present invention, a welding method using the same, and a mode (embodiment) of welding a metal will be described する. However, the present embodiment is an example, and is not intended to limit the present invention. In addition, "%" means "% by mass" unless otherwise specified.
Flux cored wire
The flux-cored wire (hereinafter, simply referred to as "wire") according to the present embodiment is used for gas shielded arc welding with positive polarity, and includes a cylindrical sheath and a flux filled inside the sheath. The positive polarity is an electrode arrangement in which the wire side is negative and the base material side is positive.
The flux-cored wire may be of any form of a seamless type having no seam on the outer surface and a seamed type having a seam on the outer surface. The flux-cored wire may or may not be plated with copper on the surface of the wire, that is, on the outer side of the sheath. The material of the outer skin is not critical and may be either mild steel or stainless steel, and is not particularly limited as long as the characteristics of the present invention are satisfied.
The flux of the flux-cored wire of the present embodiment contains a fluoride powder and a metal powder.
The fluoride powder comprises BaF2And from SrF2、AlF3And CaF2At least one selected from the group consisting of BaF in a content of mass% with respect to the total mass of the welding wire2：1.0～4.5％、SrF2: 2.0% or less of CaF2: 0.45% or less and AlF3: less than 0.70%.
At least 1 metal element among the metal elements constituting the fluoride powder and the metal powder is at least one element of Gibbs energy of-200 to-150 kcal/mol O in Ehrngham diagram at 1500 to 1600 ℃ in the case of oxide2The strongly deoxidizing metallic element of (4).
Further, the contents of the oxides and carbonates in the flux are, in mass% with respect to the total mass of the wire, the oxides: 0.5% or less, and carbonate: less than 0.5 percent.
Hereinafter, a mechanism of improving the weldability and a mechanism of obtaining a good bead shape by preventing the seizure even in the overhead welding, which are the features of the present invention, in the welding using the flux cored wire of the present embodiment will be described.
< mechanism (1) > < improvement of deposition of flux-cored wire
The flux-cored wire of the present embodiment is used in a positive polarity. Generally, when the welding wire is used in a positive polarity, it is found that the stability of the arc is poor and good welding cannot be performed. On the other hand, when the basic flux-cored wire disclosed in patent documents 1 and 2 designed for positive polarity is used, a stable arc can be obtained even in positive polarity, and excellent welding can be performed in all postures. It is also known that a stable arc can be obtained in gas tungsten arc welding (hereinafter referred to as "GTAW") in which a tungsten electrode is used as a non-consumable electrode and welding is generally performed with a positive polarity.
The present inventors have clarified a mechanism that stable arc can be obtained even in a positive polarity and weldability is improved in a flux-cored wire, based on the reason that GTAW has excellent arc stability.
First, the mechanism of GTAW is explained. Since tungsten used for the electrode has a high melting point of 3695K, the electrode is not melted during welding, but is heated to a very high temperature in a solid state. It is known that hot electrons are emitted from high temperature materials following the Richardson-Dushmann equation shown below, and that tungsten electrodes in welding are also believed to emit hot electrons.
Richardson-Dushmann equation
Je＝A0T2exp(－eVw/kT)
Je: current density [ A/cm ] caused by thermionic emission2]，A0: richardson constant (120.4[ A/cm ]2·K2]) And T: absolute temperature [ K ]]And e: basic charge (1.602 × 10)－19[C]) And Vw: work function [ eV]And k is as follows: boltzmann constant (1.381X 10-23 [ J/K)])
Here, for example, a welding current of 200A is considered to flow. GTAW electrode is widely usedThe work function (Vw) of thoriated tungsten electrodes is 2.63eV (see Andeng et al, welding arc phenomenon (revised edition), Productus, 1967)). When an arc was generated from a range of 1.5mm from the tip at an electrode tip angle of 60 degrees, the surface area of the arc generating portion was 4.71mm2. In this case, the transition of the thorium tungsten electrode temperature as shown in fig. 1 can be predicted based on the above Richardson-Dushmann equation. Accordingly, when the arc generating portion is heated to 2522K, the current of 200A can be supplied by stable thermionic emission, which means that the arc is stable. On the other hand, since tungsten has a melting point of 3695K, the electrode can be maintained in a solid state even in an arc stable state of 2522K. In this manner, the state of the cathode that supplies the current necessary for discharge by thermionic emission is referred to as "hot cathode". In a hot cathode, the electrode loses energy due to thermionic emission, in other words is cooled, whereby the electrode temperature can be maintained.
Based on the above, the following studies are made on the flux cored wire.
The wire sheath of the flux-cored wire is restricted depending on the type of the base material to be welded and the target joint performance. As a result, the wire sheath is made of steel in most cases. Because the melting point of steel is about 1770K, it is not possible to provide hot electrons as shown by the formula Richardson-Dushmann at the temperature of the solid or droplet prior to detachment from the wire tip with the composition contained in conventional flux cored wires containing titanium oxide in large amounts. Incidentally, the so-called ordinary composition is titanium oxide (Vw: 3.87eV), silicon oxide (Vw: 5.00eV), iron, an alloy element, or the like.
Therefore, in the present invention, it is considered that a flux containing a substance capable of achieving a low work function activates thermionic emission and the flux-cored wire can also serve as a hot cathode. As a substance capable of achieving a low work function, BaF is mentioned2(hereinafter, also referred to as "barium fluoride"). Barium fluoride is free of fluorine in a high-temperature environment, and barium has a high affinity for oxygen, so that barium oxide is produced in the presence of oxygen. Since the work function of the barium oxide is very low, 0.99eV, it is easy to judge that the heat cathode is formed.
In the flux-cored wire, when the wire is melted, the outer sheath of the wire and the metal powder contained in the flux are melted and easily mixed. However, the metal powder and a compound stable in a high-temperature environment of the melting portion (hereinafter, also referred to as "stable metal compound") are not mixed. Further, as the compound stable in a high temperature environment, an oxide, a carbide, a sulfide, a nitride, and the like can be cited, but from the viewpoint of affinity, it is considered that the compound becomes an oxide like the above-mentioned barium oxide in many cases. The stable metal compounds are easily mixed with each other, but the stable metal compounds are not mixed with the molten metal. The molten metal is a state in which a single metal or an alloy is molten.
Therefore, when the wire is used in a positive polarity, a portion of the molten metal portion and the stable metal compound portion having a low work function becomes a cathode point, and an arc is generated. On the other Hand, in the molten metal portion, for example, the work function (Vw) of iron is 4.67 to 4.81e V, and the work function (Vw) of Ni is 5.04 to 5.35eV (refer to CRC Hand Book of Chemistry and Physics, 78 th edition, CRC Press (1998)), and the work function is relatively high. Therefore, the arc welding cannot be a stable cathode point, and the stability in the arc welding with a positive polarity largely depends on the properties of the stable metal compound.
As described above, when barium fluoride is added to the flux, barium oxide is generated in the wire-melted portion during welding. Since thermal electrons are easily emitted from the stable metal compound such as barium oxide, the resulting hot cathode is very stable. However, if barium fluoride is added alone, the wire is judged to have a decreased melting rate because of the strong cooling effect.
In view of the above, the present invention provides a welding wire having excellent arc stability by controlling the work function of a stable metal compound functioning as a cathode point, suppressing a decrease in the melting rate of the welding wire, and maintaining a stable heat cathode polarity.
The work function control for stabilizing the metal compound will be described below.
In explaining work function control of a stable metal compound, the following 1. and 2. are assumed.
1. The surface temperature of a droplet in stable mag (metal active gas) welding is about 2300K (refer to wakaki et al, which is a measure of the surface temperature of a molten pool by infrared bichromatic radiation thermometry, vol.27 (2009)).
2. The area of the arc generating part is consistent with the sectional area of the welding wire.
Next, a relationship between the work function assumed to be a stable metal compound and the current generated by hot electrons at 2300K, which is assumed to be an arc discharge from the tip of the wire, was obtained from Richardson-Dushmann equation. The calculation is carried out in the range of 1.0-2.0 mm of the diameter (phi) of the filament.
Among the calculated wire diameters, the work function representing the diameter is shown in fig. 2 as a function of current. Further, from the results of the calculation, the value of the work function of the current generated by the thermoelectrons, which is higher than 200A, is found for each wire diameter (Φ) and is represented by the plot of fig. 3. Fitting the plot in fig. 3 with a quadratic approximation curve can obtain the right side of the following equation. The value on the right side can be said to represent the upper limit of the work function value of the stable metal compound capable of obtaining a stable heat-negative polarity with respect to the wire diameter.
y≤－0.0908x2+0.5473x+1.547
In the formula, x represents the wire diameter, and y represents the work function value of a stable metal compound capable of obtaining a stable heat anion.
In actual welding, it is difficult to accurately measure the temperature and area of the arc generating portion and the work function of the stable metal compound in the arc. Therefore, the composition of the stable metal compound is discussed according to the experimental results with reference to the work function of the oxide assumed to be generated from the added stable metal compound.
In addition to the above, it was determined that a low boiling point substance may be added to the flux of the flux-cored wire in order to further improve arc stability. Hereinafter, the effect of the low boiling point substance will be described.
In general, in the droplet transition of the welding wire, a force called an electromagnetic contraction force, that is, a force which is intended to contract in the direction of the center of the flow of a substance in which a current flows acts on the molten portion, and the molten portion at the tip of the welding wire is separated and drops as a droplet. On the other hand, in the flux-cored wire capable of obtaining a stable arc with a positive polarity, a large current flows mainly from the stable metal compound portion, and therefore a large current does not flow to the droplet at the tip of the wire. Therefore, it is necessary to apply a driving force for droplet transfer in a form other than the electromagnetic contraction force, which is derived from the explosive force accompanying vaporization of the low boiling point substance contained in the flux.
It is required for the low boiling point substance to evaporate near the wire tip and exert explosive force on the droplet. In other words, it is desirable that the low boiling point substance has a boiling point lower than the melting point of steel, i.e., lower than the range of 1500 ℃, preferably 1300 ℃ or lower.
As low boiling point substances, Li, Mg, Zn, AlF are considered3And the like. In the case of metals, since evaporation can be expected sufficiently even in the case of alloys, they may be added from metal powders such as Al — Li alloys and Al — Mg alloys.
Since the explosive power depends on the volume after gasification, the content of the low boiling point substance is preferably 1.0X 10 in terms of the amount (mol) of the substance in the total mass of the wire－4The mol/g is higher.
< prevention of burn-through in overhead welding posture, stabilization mechanism of bead shape (2) >)
According to the above mechanism (1), arc stability and high weldability can be ensured during welding, and high efficiency can be achieved. However, with the mechanism (1) alone, it is difficult to prevent burnthrough and obtain a good bead shape in a difficult welding posture in which the molten pool is affected by gravity, particularly in welding in an overhead welding posture. For example, if CaF is added in a large amount2The deposition rate is increased. That is, the wire feed speed improvement rate is high, and high deposition can be obtained. On the other hand, good overhead welding is difficult. That is, it is difficult to prevent burning-through and obtain a good bead shape.
Therefore, in the present invention, it is considered that the factors for preventing burnthrough and ensuring the bead shape when the molten pool is affected by gravity are the state of formation of the oxide film from immediately below the arc until the molten pool solidifies. In general, in overhead welding, factors for preventing burnthrough and maintaining the shape of the bead are causedIs considered to be the surface tension of the molten bath, i.e. the gas-liquid interfacial tension. However, CO is often used as a gas atmosphere for arc welding2Etc., the oxygen partial pressure of the atmosphere is very high. Therefore, it is considered that the molten pool immediately below the arc is dominated by surface tension, but when the molten pool passes directly below the arc, an oxide film is formed immediately on the surface of the molten pool due to the height of the oxygen partial pressure. Therefore, in the present invention, it is considered that the influence of the surface tension of the oxide film as a solid is not the influence of the surface tension of the molten pool until the molten pool is completely solidified.
For example, CaF is added in large amounts2In the case where Ca is an element having a very high affinity for oxygen, Ca is present as a stable oxide in the arc generating portion and functions as a cathode point, which corresponds to comparative example 2 described later. However, if the stable oxide exists excessively, it is aggregated in the molten pool, and if the aggregate floats on the surface of the molten pool, the thickness of the oxide film varies. As a result, the oxide film thickness portion remains as island-like slag during solidification, and the bead is likely to be dented in appearance. In addition, the thin portion of the oxide film is raised by the influence of gravity, or burn-through occurs in some cases.
The metal element-containing compound generated as the oxide film is not limited to any one, and its contribution to the method of adding the metal element to the wire, the affinity with oxygen, the melting point of the metal element oxide, and the like is considered.
As described above, since the stable oxide in the molten pool in an excessive amount adversely affects the welding in the overhead welding posture, it is necessary to suppress the oxidation reaction as much as possible during the time when the tip of the wire is melted into the molten pool immediately below the arc, and to control the oxidation reaction so that a uniform oxide film is formed on the surface of the molten pool. Thus, the addition of oxides to the flux is suppressed. Further, an oxide having a low affinity is required to be suppressed because it serves as an oxygen source to promote an increase in the amount of a stable oxide, and an oxide having a high affinity is required to be suppressed because it is directly aggregated to adversely affect the oxide.
In addition, since carbonate contained in the flux also serves as an oxygen source in the droplet and constitutes a factor for increasing the amount of stable oxide, it is necessary to suppress the addition to the wire.
Therefore, in order to form a uniform oxide film on the surface of the molten pool, a metal element that forms the basis of the oxide film is added to the flux as a metal powder or a fluoride. In addition, in order to further secure the high melting effect, it is preferable to add the metal element as follows: at least one of a metal powder of a metal element having a lower affinity for oxygen than the metal element of the fluoride that forms the base of the cathode spot and a fluoride powder is added.
On the other hand, if the affinity for oxygen is too low, the formation of an oxide film may be slow, which may adversely affect the appearance of the weld bead. Therefore, the degree of affinity with oxygen needs to be more appropriate.
Based on the above discussion, it has been found that, in the present invention, the degree of affinity with oxygen can be adjusted by selecting a metal element whose Gibbs energy is within a certain range of the standard formation temperature of 1500 to 1600 ℃ which is considered as the temperature of the bath surface.
Specifically, when the types or amounts of the fluoride and the metal powder are changed and examined, at least one point of Gibbs energies generated at 1500 to 1600 ℃ in the Ehrunham diagram of the metal oxide is-200 to-150 kcal/molO2When the strongly deoxidizing metal element (2) is used as a fluoride or as a metal powder of a single or an alloy, it is judged that a good bead appearance can be obtained without burnthrough. In the case where the metal element is a transition metal element, since the metal element can have a plurality of valences as an oxide, various equilibrium states are adopted, but Gibbs energy may be generated in the above range as a standard for an oxide existing as a stable phase.
Examples of the strongly deoxidizing metal element that satisfies the above criteria and produces a Gibbs energy range include Al, Mg, Zr, Ti, Ba, Sr, and the like. Among them, it is preferable to contain a strong deoxidizing metal element such as Al, Mg, Zr, etc. having high affinity as a fluoride or a metal powder in an appropriate amount in the flux. This enables more appropriate overhead welding. This is considered to be an influence of uniform oxide film formation on the surface of the molten pool.
< flux >
Hereinafter, the composition of the flux-cored wire of the present embodiment, which reflects the above-described mechanisms (1) and (2), will be described in detail. Unless otherwise specified, the mass of each component contained in the wire, that is, the sheath and the flux in total is specified in a ratio (%) to the total mass of the wire.
The flux-cored wire of the present embodiment is used for positive gas shielded arc welding, and the flux contains a fluoride powder and a metal powder. In the fluoride powder, BaF is contained2And from SrF2、AlF3And CaF2At least one selected from the group consisting of BaF in a content of mass% with respect to the total mass of the welding wire2：1.0～4.5％，SrF2: 2.0% or less, CaF2: 0.45% or less, and AlF3: less than 0.70%. At least 1 metal element among the metal elements constituting the fluoride powder and the metal powder is at least one point of-200 to-150 kcal/mol O in Gibbs energy at 1500 to 1600 ℃ in Ehrngham diagram when used as an oxide2The strongly deoxidizing metallic element of (4). Further, the contents of the oxides and carbonates in the flux are, in mass% with respect to the total mass of the wire, oxides: 0.5% or less, and carbonate: less than 0.5 percent.
Fluoride powder
(BaF2：1.0～4.5％)
BaF2The fluoride powder is an essential component of the flux. By setting the content to 1.0 mass% or more, the cathode point is stabilized and the arc is stabilized in the positive gas shielded arc welding, whereby the amount of spatter generated can be reduced. Further, BaF is considered to stabilize the arc2The content of (b) is preferably 1.5% by mass or more.
In addition, by making BaF2The content of (b) is 4.5 mass% or less, and thus excessive reduction in work function of the molten portion of the wire can be suppressed, and high weldability can be maintained. In addition, BaF is preferable from the viewpoint of further improving the high deposition performance2The content of (b) is 4.0 mass% or less.
(SrF2: 2.0% or less of CaF2: AlF less than 0.45%3: 0.70% or less)
The flux contains SrF as fluoride powder2、CaF2And AlF3At least 1 selected from the group consisting of. By using BaF2The addition of these fluoride powders to the wire can increase the deposited amount by controlling the work function of the molten portion of the wire, but if the content is too large, the work function becomes too high, and the arc becomes unstable. Thus, it is present in an amount of SrF2: 2.0% or less, CaF2: 0.45% or less, and AlF3: less than 0.70%.
SrF2Preferably 1.50% or less, more preferably 1.30% or less, CaF2Preferably 0.35% or less, AlF3The content of (b) is preferably 0.50% or less.
Due to the inclusion of SrF2、CaF2And AlF3The lower limit of the content is not particularly limited, but the content preferably satisfies the relationship represented by the following formula.
0.5≤SrF2(％)+10.1×CaF2(％)+2.3×AlF3(％)
Since a higher welding effect can be obtained by setting the right side of the inequality to 0.5 or more, it is preferably 0.7 or more. In addition, from the viewpoint of welding workability such as spatter generation and ensuring good overhead weldability, the right side is preferably 5.0 or less.
In addition, BaF2、SrF2、CaF2And AlF3The total content of (b) is preferably higher than 2% by mass% based on the total mass of the wire, more preferably 2.5% or more, from the viewpoint of stabilizing the cathode point. The total content is preferably 5% or less, more preferably 4.0% or less, from the viewpoint of suppressing excessive fluorine generation and further stabilizing the droplet transfer.
In the flux, BaF can be contained2、SrF2、CaF2And AlF3Other fluoride powders. As other fluoride powders, mention may be made ofLiF, NaF, MgF2、K2SiF6And the like.
The total content of the fluoride powder is preferably higher than 2% by mass relative to the total mass of the wire from the viewpoint of stabilization of the cathode point, and more preferably 3.5% or more from the viewpoint of promoting the detachment of droplets. The total content of the fluoride powder is 6% or less, and the excessive generation of fluorine is suppressed, and is preferably from the viewpoint of further stabilizing the droplet transition, more preferably 5% or less, and still more preferably 4.5% or less.
The BaF is contained in an amount corresponding to the total amount of the fluoride powder in order to stabilize the cathode point2、SrF2、CaF2And AlF3The ratio of the total content of (B)/(BaF)2+SrF2+CaF2+AlF3) The total amount of fluoride powder } is preferably 0.5% or more, more preferably 0.6% or more. The upper limit may be 1, that is, no other fluoride powder is contained.
Metallic powder
The metal powder contained in the flux may be a single metal powder or an alloy metal powder.
Examples of the metal element constituting the metal powder include Al, Mg, Zr, Mn, Si, Ni, Cr, and Fe. Among them, metal powder containing at least 1 element among Al, Mg and Zr is preferable. Examples of the form of the alloy include, but are not limited to, Fe-Al, Al-Mg, Fe-Mn, and Fe-Si-Mn.
Al, Mg, and Zr as metal powders act as strong deoxidizers to reduce the amount of oxygen in the molten metal, increase the surface tension of the molten metal, and form a uniform oxide film on the surface of the molten pool. This provides an effect of improving the bead shape against the influence of gravity during all-position welding.
As other metal powders, Mn, Si, Ni, and Cr are effective for securing mechanical properties such as strength and toughness of the weld metal.
Strongly deoxidizing metallic element
At least 1 metal out of metal elements constituting the fluoride powder and the metal powder contained in the fluxAn element having at least one point of Gibbs energy of 1500 to 1600 ℃ in an Ehrun Hamming diagram when the element is an oxide, of-200 to-150 kcal/mol O2The strongly deoxidizing metallic element of (4). The strongly deoxidizing metal element is preferably at least one point of the Gibbs energy of formation of the above criteria is-180 kcal.mol－1Above, it is preferably-160 kcal/mol O2The following.
Examples of such strongly deoxidizing metal elements include Al, Mg, Zr, Ti, Ba, Sr, etc., and among them, at least 1 strongly deoxidizing metal element selected from the group consisting of Al, Mg, and Zr is more preferably contained.
Al, Mg, and Zr may be contained in any form of fluoride powder and metal powder, or may be contained in both forms of fluoride powder and metal powder. The metal powder may be a single metal or an alloy.
From the viewpoint of obtaining a good bead shape while maintaining high deposition, the content of Al is preferably 12 × 10 in terms of the amount of material relative to the total mass of the welding wire－4mol/g or less, more preferably 11X 10－4mol/g or less, or may not be contained. The content of Al here means the total content of Al contained as a fluoride powder and Al contained as a metal powder, and the same applies to Mg and Zr below.
For the same reason, the content of Mg is preferably 5X 10 in terms of the mass of the material relative to the total mass of the wire－ 4mol/g, more preferably 3X 10－4mol/g or less, or may not be contained.
For the same reason, the Zr content is preferably 5X 10 in terms of the mass of the material relative to the total mass of the wire－ 4mol/g or less, more preferably 3X 10－4mol/g or less, or may not be contained.
The total content of Al, Mg and Zr (Al + Mg + Zr) is preferably 8X 10 in terms of the total mass of the wire－4mol/g or more, more preferably 10X 10－4mol/g or more, and preferably 15X 10－4mol/g or less, more preferably 13X 10－4molThe ratio of the carbon atoms to the carbon atoms is less than g.
In the case of a metal powder containing Mg as a strongly deoxidizing metal element, Mg as a Mg-containing metal powder, and AlF as a fluoride powder3The total of the contents of (a) and (b) preferably satisfies a relationship represented by the following formula in terms of the amount of substance relative to the total mass of the wire. The metal powder containing Mg may be a single metal powder or an alloy metal powder.
1.0×10－4≤Mg(mol/g)+AlF3(mol/g)≤5.0×10－4
The total content is more preferably 2.0X 10－4The above is more preferably 4.0 × 10－4The following.
Other compositions
The flux may contain other components within a range not to impair the effects of the present invention.
However, if the oxide is excessively present in the flux, the effect of forming a uniform oxide film on the surface of the molten pool in the present invention is hindered, and poor bead appearance occurs during welding in the overhead welding position. Therefore, the total content of the oxides with respect to the total mass of the wire is 0.5 mass% or less. The total content of the oxides is preferably 0.2 mass% or less, and more preferably 0.1 mass% or less.
In addition, carbonates generally generate carbon dioxide upon heating to produce metal oxides. Therefore, the bead appearance is deteriorated as in the case of adding an oxide. If the amount of carbon dioxide is excessively added, the amount of carbon dioxide generated becomes excessively large, which adversely affects the welding workability. Therefore, the total content of carbonate with respect to the total mass of the wire is 0.5 mass% or less. The total content of the carbonate is preferably 0.2% by mass or less, and more preferably 0.1% by mass or less.
The flux ratio (hereinafter also referred to as flux filling ratio) with respect to the total mass of the wire is preferably 10 mass% or more in view of ease of production. In addition, the flux content is preferably 20 mass% or less in view of obtaining arc stability.
< optional component >
Any component contained in the welding wire of the present embodiment is added to the flux or the sheath in the form of a pure metal, an alloy, or a compound such as an oxide, a carbide, or a nitride.
The optional components may contain predetermined amounts of C, Si, Mn, Ni, Mo, W, Nb, V, Cr, Ti, N, S, P, B, Cu, Ta, REM (rare earth element) and the like in accordance with the mechanical properties of the weld metal and the welding conditions required. Further, an alkali metal or a compound thereof may be contained as necessary.
In the case of iron-based, the balance is preferably made of Fe and unavoidable impurities.
As the composition of any component of the flux-cored wire used for mild steel, high-tension steel, low-temperature steel, weathering steel, and the like, for example, in terms of mass fraction with respect to the total mass of the wire, it is preferable to further satisfy C: 0.5% or less, Si: 2.0% or less, Mn: 3.0% or less, Ni: 5.0% or less, Mo: 3.0% or less, W: 3.0% or less, Nb: 3.0% or less, V: 3.0% or less, Cr: 5.0% or less, Ti: 3.0% or less, N: 0.05% or less, S: 0.05% or less, P: 0.05% or less, B: 0.05% or less, Cu: 2.0% or less, Ta: 3.0% or less, and REM: less than 0.1%. These elements may not be included.
In addition to the above, the arc stabilizer may further contain a metal powder and a metal compound composed of one or more alkali metal elements in the flux-cored wire, and the alkali metal elements in this case may function as the arc stabilizer. Examples of the alkali metal element include K, Li, and Na. The total content of the metal powder composed of the alkali metal element and the metal compound is preferably 3 mass% or less, more preferably 2 mass% or less, with respect to the total mass of the wire, and the balance is F e and impurities.
The composition of any of the above components can be selected from the group consisting of iron-based alloys and the following compositions according to JIS Z3313: for mild steel, high tensile steel or low temperature steel in 2009, or as JISZ 3320: flux-cored wire used for weathering steel in 2012 generally has the same composition as that used for flux-cored wire.
Specific preferred modes are as follows. These elements are not necessarily contained.
C is a component that affects the strength of the weld metal, and the strength increases as the content increases. In the strength range required for steel grades commonly used, such as mild steel, high tensile steel, and low temperature steel, the content of the steel is preferably 0.5% or less, and more preferably 0.2% or less. On the other hand, it is preferably 0.001% or more for adjusting the strength.
Si is a component that affects the strength and toughness of the weld metal. In order to satisfy the range of mechanical properties required for steel grades commonly used for mild steel, high tensile steel, low temperature steel, or the like, the Si content is preferably 2.0% or less, and more preferably 1.2% or less. On the other hand, the content of Si is preferably 0.1% or more.
Like Si, Mn is a component that affects the strength and toughness of the weld metal. In order to satisfy the range of mechanical properties required for general steel grades such as mild steel, high tensile steel, and low temperature steel, the Mn content is preferably 3.0% or less, and more preferably 2.5% or less. The Mn content is preferably 0.5% or more.
Ni stabilizes the austenite structure of the weld metal, and is a component for improving low-temperature toughness, and is a component capable of adjusting the amount of crystals of the ferrite structure. The Ni content is preferably 5.0% or less, and more preferably 3.0% or less. In addition, when used for low-temperature steel or the like, the Ni content is preferably 0.20% or more.
Mo is a component for improving high-temperature strength and pitting corrosion resistance. In order to satisfy the range of mechanical properties required for general steel grades such as mild steel, high tensile steel, and low temperature steel, the content of Mo is preferably 3.0% or less, and more preferably 2.0% or less. In addition, when used for high tensile steel, heat resistant steel, or the like, the content of Mo is preferably 0.10% or more.
W is a component for improving the high-temperature strength and pitting corrosion resistance. The W content in a range suitable for mechanical properties required for general steel grades such as mild steel, high tensile steel, and low temperature steel is preferably 3.0% or less, and more preferably 2.0% or less.
Nb is a component that affects mechanical properties such as strength. The Nb content is preferably 3.0% or less, and more preferably 2.0% or less, in order to satisfy the range of mechanical properties required for general steel grades such as mild steel, high tensile steel, and low temperature steel.
V exerts an effect of improving the strength of the weld metal, while decreasing toughness and crack resistance. Therefore, the content of V is preferably 3.0% or less, more preferably 2.0% or less.
Cr is a component that affects mechanical properties such as strength of the weld metal. The Cr content is preferably 5.0% or less, and more preferably 3.0% or less, in order to satisfy the range of mechanical properties required for general steel grades such as mild steel, high-tensile steel, and low-temperature steel. In addition, when used for heat-resistant steel or the like, the content of Cr is preferably 0.10% or more.
Ti and C, N combine to contribute to grain refinement and mainly improve the toughness of the weld metal. In general steel grades for mild steel, high tensile steel, low temperature steel, or the like, the Ti content is preferably 3.0% or less, more preferably 1.0% or less, in order to improve toughness. The content of Ti is preferably 0.01% or more.
N is a component which is interstitially dissolved in the crystal structure to improve the strength. On the other hand, since the weld metal causes a void defect such as a void or a pit, it is not positively added except when strength is particularly required. The content of N is preferably 0.05% or less, more preferably 0.03% or less. The content of N is preferably 0.0010% or more.
S is an element that reduces the viscosity and surface tension of droplets when the wire is melted, and makes the droplets smoothly pass through to make the spatters small and granular, thereby exhibiting the effect of improving the welding workability, while reducing the crack resistance. Therefore, the content of S is preferably 0.05% or less, and more preferably 0.03% or less. The content of S is preferably 0.0010% or more.
P reduces crack resistance and mechanical properties of the weld metal, and therefore the content of P is preferably suppressed to 0.05% or less, more preferably 0.03% or less.
B prevents the toughness from being lowered by nitrogen in the weld metal, and on the other hand, it lowers the crack resistance. Therefore, the content of B is preferably 0.05% or less, and more preferably 0.03% or less. In addition, the content of B is preferably 0.0005% or more in securing toughness.
Cu contributes to the improvement of the strength and weather resistance of the weld metal. When it is desired to obtain strength and weather resistance in the ranges required for general-purpose steel grades such as mild steel, high-tensile steel, and low-temperature steel, the Cu content is preferably 2.0% or less, more preferably 1.0% or less. In addition, when the strength and weather resistance of the weld metal are to be ensured, the content of Cu is preferably 0.01% or more.
Ta is a component that affects mechanical properties such as strength. The preferable Ta content for satisfying the range of mechanical properties required for general steel grades such as mild steel, high tensile steel, and low temperature steel is preferably 3.0% or less, and more preferably 2.0% or less.
REM means a rare earth element, and Ce, La, etc. are exemplified. REM has a high affinity for S, suppresses grain boundary segregation of S, and also exhibits an effect of suppressing high-temperature cracking due to S. Therefore, when further stabilization of the arc is desired, the total content of REM is preferably 0.1% or less, more preferably 0.05% or less.
In addition, the balance is preferably Fe and impurities.
The content of Fe as the balance is preferably 80 mass% or more, and further preferably 98 mass% or less.
The term "impurity" means an element intentionally added thereto, and examples of the element other than the above include Sn, Co, Sb, and AS. When each element is contained as an oxide, O is also included in the balance. The total content of impurities is preferably 0.5% by mass or less, and more preferably 0.3% by mass or less.
As the composition of the alloy components of the flux-cored wire used for stainless steel and the like, for example, in terms of mass fraction with respect to the total mass of the wire, it is preferable to further satisfy C: 0.5% or less, Si: 2.0% or less, Mn: 3.0% or less, Ni: 5.0-20.0%, M o: 5.0% or less, W: 3.0% or less, Nb: 3.0% or less, V: 3.0% or less, Cr: 15.0-30.0%, Ti: 3.0% or less, N: 0.50% or less, S: 0.05% or less, P: 0.05% or less, B: 0.05% or less, C u: 2.0% or less, Ta: 3.0% or less, and REM: less than 0.1%. These elements may not be included.
In addition to the above, a metal powder and a metal compound composed of 1 or more alkali metal elements in the flux-cored wire may be further contained, and the alkali metal elements in this case function as an arc stabilizer. Examples of the alkali metal element include K, Li, and Na. The total content of the metal powder composed of the alkali metal element and the metal compound is preferably 3 mass% or less, and more preferably 2 mass% or less, based on the total mass of the wire.
The composition of the alloy components can be adjusted in accordance with the following formula of iron-based alloy or JIS Z3313: flux-cored wires for stainless steel of 2007 were generally used with the same composition.
In a specific preferred embodiment, Ni and elements other than Cr, Mo, Nb, and N have the same composition as the alloy components of the flux-cored wire used for mild steel, high-tensile steel, low-temperature steel, weather-resistant steel, and the like.
Ni is a component for stabilizing the austenite structure of the weld metal and improving the toughness at low temperatures, and is a component added in a fixed amount for the purpose of adjusting the amount of crystals of the ferrite structure. From the balance of these properties, the Ni content may be in the same range as the usual content of stainless steel, and is preferably 5.0% or more, and more preferably 9.0% or more. The Ni content is preferably 20% or less, and more preferably 16% or less.
Cr is a component that improves the corrosion resistance of the weld metal, and if it is contained excessively, it reacts with the oxidizing shielding gas to form an oxide, which affects the balance of the slag component composition. From the balance of these properties, the Cr content may be in the same range as the usual content of stainless steel, preferably 15% or more, and more preferably 17% or more. The content of Cr is preferably 30% or less, and more preferably 25% or less.
Mo is a component that improves corrosion resistance, particularly pitting corrosion resistance, and on the other hand, Mo is a rare component that is not economical. From the balance of these properties, the content of Mo may be in the same range as the usual content of stainless steel, and is preferably 5.0% or less, more preferably 4.0% or less.
Nb is a component for improving corrosion resistance by binding and immobilizing C to suppress deterioration of corrosion resistance due to the formation of Cr carbide, that is, to suppress sensitization, and is a component for deteriorating crack resistance. Therefore, the content of Nb is preferably 3.0% or less, and more preferably 2.0% or less. When used for anti-sensitization steel, the content of Nb is preferably 0.2% or more.
N is a component that exerts effects such as stabilization of the austenite structure of the weld metal, improvement of the strength of the weld metal, and improvement of pitting corrosion resistance, and on the other hand, it causes a void defect. From the balance of these properties, the content of N is preferably 0.5% or less, more preferably 0.4% or less. In addition, when used for high corrosion-resistant steel, extremely low temperature steel, or the like, the content of N is preferably 0.1% or more.
The sheath of the flux-cored wire is not particularly limited, and for example, ordinary steel, SUH409L (JIS G4312: 2019), SUS430, SUS304L, SUS316L, SUS310S (JIS G4305: 2012), and the like can be used.
In the flux-cored wire, when the amount of the flux is small relative to the inner space formed in the outer sheath, it becomes difficult to form a flux column during welding. In addition, flux migration occurs in the wire. In this case, the flux content of the wire in the longitudinal direction may vary depending on the vibration conditions of the wire manufacturing line, and the like, and the quality of the wire may become unstable. Therefore, the content of the flux in the wire is preferably 10% or more, and more preferably 11% or more in mass fraction with respect to the total mass of the wire.
On the other hand, in order to wrap a large amount of flux with a small amount of sheath, a sheath having a small wall thickness may be used, but if the sheath is extremely thin, the sheath may be broken in the wire drawing process, and the wire may be broken. Therefore, the content of the flux in the wire (hereinafter, also referred to as flux content) is preferably 20% or less, and more preferably 18% or less.
The wire diameter of the flux-cored wire is not particularly limited, but considering the combination with a general welding apparatus and the welding operability, the diameter is preferably 0.9 to 2.0mm, more preferably 1.2mm or more, and further preferably 1.6mm or less.
The cross-sectional shape of the welding wire is not particularly limited, and the welding wire can be used for a type in which a seam is formed on the outer surface, or a seamless type in which the seam is not formed. In the case of the seamless type, the surface may be treated with Cu plating or the like.
Method for producing
The flux-cored wire of the present embodiment can be manufactured by a conventional method, and is not particularly limited. For example, flux is filled in the sheath. In this case, the composition of the sheath, the composition of the flux and the content are appropriately adjusted so as to fall within the above ranges. Subsequently, the wire having the flux filled in the sheath is subjected to rolling or wire drawing, thereby reducing the diameter thereof to obtain a flux-cored wire having a predetermined outer diameter.
Welding method
The welding method of the present embodiment is gas shielded arc welding using the positive flux-cored wire and a shielding gas.
The shielding gas is not particularly limited, and a single shielding gas having only one component may be used, or a mixed gas of two or more types may be used. For example, it is preferable to contain CO as an active gas component2The gas is preferably 60 vol% or more, and the inert gas component is preferably 60 vol% or more of Ar gas.
Further, the welding current, the welding voltage, the welding speed, the welding posture, the flow rate of the shielding gas, and the like are appropriately adjusted and determined at the time of welding. In addition, the flux-cored wire of the present embodiment does not cause a bead shape defect such as burnthrough, beading, and undercut even when welding is performed in a posture that is easily affected by gravity, such as a vertical welding posture or an overhead welding posture, and has excellent high-weldability, so that excellent welding efficiency can be obtained.
Weld metal
The weld metal of the present embodiment is formed by welding using the flux-cored wire described above. As the base material to be welded, a generally used one such as mild steel, high tensile steel, low temperature steel, or stainless steel can be used.
The composition of the weld metal formed by welding varies depending on the composition of the base metal and the wire, the type of protection, and other welding conditions, and therefore, the composition cannot be defined in any way, but all of them have a good bead shape.
Examples
The present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples, and can be modified within a range that can meet the gist of the present invention, and all of these are included in the technical scope of the present invention.
< evaluation method >
(evaluation of high deposition and evaluation of ability to weld on the back)
Welding was performed under the following welding conditions, and as a high-weldability evaluation, the wire feed speed during welding was measured, and as an overhead welding possibility evaluation, it was determined whether overhead welding was possible.
The wire feed rate was evaluated based on the wire feed rate (m/min) when the flux-cored wire of comparative example 1 was used, but it can be said that the wire feed rate had high deposition performance if the improvement rate was 10% or more. The improvement rate is an increase rate of the wire feed speed relative to comparative example 1.
Further, it was confirmed whether or not the weld bead was capable of being overhead-welded at about 200mm, and the occurrence of burn-through and humpback was observed. As a result, when neither burn-through nor hump occurred, it was judged as good: has good welding bead shape. Further, when at least one of burn-through and hump occurs, it is defective. The term "burnout" refers to a phenomenon in which the weld metal sags and falls due to gravity, and the term "hump" refers to a phenomenon in which the weld metal greatly fluctuates in the height of the bead in the longitudinal direction of the weld under the influence of the force of gravity, arc pressure, surface tension, or the like.
(welding conditions)
Welding current: 240A
Welding voltage: in due course (20 to 23V.)
Welding speed: 15cm minute
Welding posture: overhead welding, flat surfacing
Tip-base metal distance: 15mm
Width of the horizontal swinging movement strip: 8mm
Yaw movement frequency: 1.2Hz
Protective gas: CO 22Gas content is 100%
Gas flow rate: 25L/min
Base material: SM490A (rolled steel for welded structure)
< examples 1 to 13 and comparative examples 1 and 2 >
Using a flux-cored wire having a composition shown in table 1 or 2, a welding test was performed according to the above (welding conditions). In the compositions of the fluxes, the oxides and carbonates were not positively added in examples 1 to 13, and the contents of the oxides and carbonates with respect to the total mass of the wire were 0.5% or less in all the flux cored wires.
[ Table 1]
TABLE 1
[ Table 2]
TABLE 2
Only BaF is contained in the flux as fluoride powder2The flux-cored wire of comparative example 1 further contains SrF as a fluoride powder2、AlF3And CaF2The results showed that 1 or more kinds of fluorides selected from the group formed significantly improved the wire feed rate and excellent weldability.
Further, by making the composition of the fluoride powder appropriate, it is possible to prevent the occurrence of burnout and humping even in the overhead welding at the welding current 240A, and to obtain a good bead shape.
It will be apparent to those skilled in the art that the present invention has been described in detail and with reference to specific embodiments thereof, but that various changes and modifications can be made therein without departing from the spirit and scope thereof. The present application is based on the japanese patent application published on 5/9/2019 (japanese patent application 2019-089013), the contents of which are incorporated herein by reference.
Claims (14)
1. A flux-cored wire for gas-shielded arc welding of positive polarity,
the flux of the flux-cored wire contains fluoride powder and metal powder,
the fluoride powder comprises BaF2And from SrF2、AlF3And CaF2At least one selected from the group consisting of, in mass% relative to the total mass of the wire,
BaF2：1.0～4.5％、
SrF2: less than 2.0 percent,
CaF2: 0.45% or less, and
AlF3: the content of the active ingredients is less than 0.70%,
at least 1 metal element among the metal elements constituting the fluoride powder and the metal powder is at least one point of-200 to-150 kcal/mol O in Gibbs energy at 1500 to 1600 ℃ in an Ehrunham diagram when used as an oxide2The strong deoxidizing metal element of (a) is,
and the contents of the oxides and carbonates in the flux are, in mass% relative to the total mass of the welding wire,
oxide: 0.5% or less, and
carbonate salt: less than 0.5 percent.
2. The flux cored welding wire of claim 1, wherein the SrF in the fluoride powder2、AlF3And CaF2The content of (b) satisfies the following relationship in mass% with respect to the total mass of the wire:
0.5≤SrF2(％)+10.1×CaF2(％)+2.3×AlF3(％)。
3. the flux-cored wire of claim 1, wherein the strongly deoxidizing metallic element is at least 1 element selected from the group consisting of Al, Mg, and Zr, in a content of, in terms of mass relative to the total mass of the wire,
Al：12×10－4less than mol/g,
Mg：5×10－4Less than mol/g,
Zr：5×10－4mol/g or less, and
(Al+Mg+Zr)：8×10－4～15×10－4mol/g。
4. the flux-cored wire as claimed in claim 1, wherein the flux rate is 10 to 20% in mass% with respect to the total mass of the wire.
5. The flux-cored wire of claim 1, wherein a total content of the fluoride powders is higher than 2% and 6% or less in mass% with respect to a total mass of the wire,
the BaF2、SrF2、AlF3And CaF2Is higher than 2% and is 5% or less in mass% with respect to the total mass of the welding wire, and
the BaF is contained in an amount corresponding to the total amount of the fluoride powder2、SrF2、AlF3And CaF2The ratio of the total content of (A), (B), (C), (B), (C), (B), (C), (B), (C), (B), (C), (B), (C), (B), (C), (B) and C)2+SrF2+AlF3+CaF2) Total amount of fluoride powder } is 0.5 or more.
6. The flux-cored welding wire of claim 1, wherein the composition of the flux-cored welding wire in mass% relative to the total mass of the wire is further satisfied
C: less than 0.5 percent,
Si: less than 2.0 percent,
Mn: less than 3.0 percent,
Ni: less than 5 percent of,
Mo: less than 3.0 percent,
W: less than 3.0 percent,
Nb: less than 3.0 percent,
V: less than 3.0 percent,
Cr: less than 5 percent of,
Ti: less than 3.0 percent,
N: less than 0.05 percent of,
S: less than 0.05 percent of,
P: less than 0.05 percent of,
B: less than 0.05 percent of,
Cu: less than 2.0 percent,
Ta: 3.0% or less, and
REM: less than 0.1%.
7. The flux-cored welding wire of claim 1, wherein the composition of the flux-cored welding wire in mass% relative to the total mass of the wire is further satisfied
C: less than 0.5 percent,
Si: less than 2.0 percent,
Mn: less than 3.0 percent,
Ni：5～20％、
Mo: less than 5.0 percent,
W: less than 3.0 percent,
Nb: less than 3.0 percent,
V: less than 3.0 percent,
Cr：15～30％、
Ti: less than 3.0 percent,
N: less than 0.50 percent of,
S: less than 0.05 percent of,
P: less than 0.05 percent of,
B: less than 0.05 percent of,
Cu: less than 2.0 percent,
Ta: 3.0% or less, and
REM: less than 0.1%.
8. The flux-cored wire of claim 6, wherein a total content of the metal powder containing one or more alkali metal elements and the metal compound in the flux-cored wire is 3% or less in mass% with respect to a total mass of the wire, and the balance is Fe and impurities.
9. The flux-cored wire of claim 7, wherein a total content of the metal powder containing one or more alkali metal elements and the metal compound in the flux-cored wire is 3% or less in mass% with respect to a total mass of the wire, and the balance is Fe and impurities.
10. The flux-cored wire according to claim 1, wherein the strongly deoxidizing metallic element contains Mg as a Mg-containing metallic powder, and the Mg content and the AlF as the Mg-containing metallic powder3The content of (b) satisfies the following relationship in terms of mass relative to the total mass of the wire:
1.0×10－4≤Mg(mol/g)+AlF3(mol/g)≤5.0×10－4。
11. a welding method using a flux-cored wire for positive polarity and a shield gas, wherein,
the flux-cored wire comprises fluoride powder and metal powder in a flux,
the fluoride powder contains BaF2And from SrF2、AlF3And CaF2At least one selected from the group consisting of, in mass% relative to the total mass of the wire,
BaF2：1.0～4.5％、
SrF2: less than 2.0 percent,
CaF2: 0.45% or less, and
AlF3: the content of the active ingredients is less than 0.70%,
at least 1 metal element among the metal elements constituting the fluoride powder and the metal powder is at least one point of-200 to-150 kcal/mol O in Gibbs energy at 1500 to 1600 ℃ in an Ehrunham diagram when used as an oxide2The strong deoxidizing metal element of (a) is,
and the contents of the oxides and carbonates in the flux are, in mass% relative to the total mass of the welding wire,
oxide: 0.5% or less, and
carbonate salt: less than 0.5 percent.
12. The welding method of claim 11, wherein the shielding gas comprises 60 vol% or more of CO2A gas.
13. The welding method of claim 11, wherein the shielding gas comprises 60 vol% or more of Ar gas.
14. A weld metal formed by welding using the flux-cored wire of any one of claims 1 to 10.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019089013A JP7231476B2 (en) | 2019-05-09 | 2019-05-09 | FLUX CORE WIRE, WELDING METHOD AND WELD METAL |
| JP2019-089013 | 2019-05-09 | ||
| PCT/JP2020/018450 WO2020226146A1 (en) | 2019-05-09 | 2020-05-01 | Flux-cored wire, welding method, and weld metal |
Publications (2)
| Publication Number | Publication Date |
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| CN113631322A true CN113631322A (en) | 2021-11-09 |
| CN113631322B CN113631322B (en) | 2023-11-14 |
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| CN202080025154.XA Active CN113631322B (en) | 2019-05-09 | 2020-05-01 | Flux-cored wire, welding method and weld metal |
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|---|---|
| US (1) | US20220219266A1 (en) |
| EP (1) | EP3967444A4 (en) |
| JP (1) | JP7231476B2 (en) |
| KR (1) | KR102647966B1 (en) |
| CN (1) | CN113631322B (en) |
| WO (1) | WO2020226146A1 (en) |
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| CN102655978A (en) * | 2009-12-16 | 2012-09-05 | 新日本制铁株式会社 | Wire containing flux for gas-sealed arc welding, allowing all-position welding |
| CN103962746A (en) * | 2014-05-08 | 2014-08-06 | 广东省工业技术研究院(广州有色金属研究院) | Gas shield flux-cored wire for electric arc welding |
| WO2015068273A1 (en) * | 2013-11-08 | 2015-05-14 | 新日鐵住金株式会社 | Flux-cored wire for gas shield arc welding, and method for welding cryogenic steel using same |
| JP2016083677A (en) * | 2014-10-24 | 2016-05-19 | 新日鐵住金株式会社 | Flux-cored wire for gas shield arc-welding |
| CN108698174A (en) * | 2016-03-08 | 2018-10-23 | 新日铁住金株式会社 | Flux-cored wire, the manufacturing method of welding point and welding point |
| CN108698175A (en) * | 2016-03-08 | 2018-10-23 | 新日铁住金株式会社 | Flux-cored wire, the manufacturing method of welding point and welding point |
| CN109641327A (en) * | 2016-09-06 | 2019-04-16 | 株式会社神户制钢所 | Flux-cored wire for gas-shielded arc welding and welding metal |
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|---|---|---|---|---|
| JPH0239359B2 (en) * | 1983-12-12 | 1990-09-05 | Kobe Steel Ltd | SERUFUSHIIRUDOAAKUYOSETSUYOFURATSUKUSUIRIWAIYA |
| JP3586362B2 (en) | 1997-08-22 | 2004-11-10 | 株式会社神戸製鋼所 | Flux-cored wire for gas shielded arc welding |
| JP3513380B2 (en) | 1998-01-26 | 2004-03-31 | 株式会社神戸製鋼所 | Carbon dioxide arc welding flux cored wire for DC positive polarity and welding method |
| JP6453178B2 (en) | 2015-07-17 | 2019-01-16 | 株式会社神戸製鋼所 | Flux-cored wire for gas shielded arc welding |
| JP6683505B2 (en) * | 2016-03-08 | 2020-04-22 | 株式会社神戸製鋼所 | Welding method using special torch |
| JP2019089013A (en) | 2017-11-13 | 2019-06-13 | 株式会社Ｓｏｋｅｎ | Oil mist particle size control method |
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2019
- 2019-05-09 JP JP2019089013A patent/JP7231476B2/en active Active
-
2020
- 2020-05-01 KR KR1020217035712A patent/KR102647966B1/en active IP Right Grant
- 2020-05-01 WO PCT/JP2020/018450 patent/WO2020226146A1/en unknown
- 2020-05-01 EP EP20801452.2A patent/EP3967444A4/en active Pending
- 2020-05-01 US US17/600,249 patent/US20220219266A1/en active Pending
- 2020-05-01 CN CN202080025154.XA patent/CN113631322B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102655978A (en) * | 2009-12-16 | 2012-09-05 | 新日本制铁株式会社 | Wire containing flux for gas-sealed arc welding, allowing all-position welding |
| WO2015068273A1 (en) * | 2013-11-08 | 2015-05-14 | 新日鐵住金株式会社 | Flux-cored wire for gas shield arc welding, and method for welding cryogenic steel using same |
| CN103962746A (en) * | 2014-05-08 | 2014-08-06 | 广东省工业技术研究院(广州有色金属研究院) | Gas shield flux-cored wire for electric arc welding |
| JP2016083677A (en) * | 2014-10-24 | 2016-05-19 | 新日鐵住金株式会社 | Flux-cored wire for gas shield arc-welding |
| CN108698174A (en) * | 2016-03-08 | 2018-10-23 | 新日铁住金株式会社 | Flux-cored wire, the manufacturing method of welding point and welding point |
| CN108698175A (en) * | 2016-03-08 | 2018-10-23 | 新日铁住金株式会社 | Flux-cored wire, the manufacturing method of welding point and welding point |
| CN109641327A (en) * | 2016-09-06 | 2019-04-16 | 株式会社神户制钢所 | Flux-cored wire for gas-shielded arc welding and welding metal |
Also Published As
| Publication number | Publication date |
|---|---|
| US20220219266A1 (en) | 2022-07-14 |
| CN113631322B (en) | 2023-11-14 |
| WO2020226146A1 (en) | 2020-11-12 |
| JP7231476B2 (en) | 2023-03-01 |
| EP3967444A4 (en) | 2023-07-26 |
| EP3967444A1 (en) | 2022-03-16 |
| KR20210145800A (en) | 2021-12-02 |
| KR102647966B1 (en) | 2024-03-14 |
| JP2020182969A (en) | 2020-11-12 |
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